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                日期类
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        <h4 id="Date类"><a href="#Date类" class="headerlink" title="Date类"></a>Date类</h4><p>从1970.1.1.0点开始到某个时刻的毫秒数，类型是long<br>1970年之前用负数表示</p>
<a id="more"></a>
<blockquote>
<p>toGMTString()不建议使用<br><br>getTime() 返回时间的毫秒数<br><br>setTime() 设置时间，毫秒数<br><br>DateFormat(父类) , SimpleDateFormat(子类)字符串和时间类的转化<br><br>new Date() 返回当前的时间<br></p>
</blockquote>
<p>将时间类转化为字符串:</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line">DateFormat df  = <span class="keyword">new</span> SimpleDateFormat(<span class="string">"yyyy年MM月dd日"</span>);</div><div class="line">Date d = <span class="keyword">new</span> Date(<span class="number">1234567L</span>);</div><div class="line">String str = df.format(d);</div><div class="line">print;</div></pre></td></tr></table></figure>
<blockquote>
<p>yyyy-MM-dd hh:mm:ss 年月日时分秒</p>
</blockquote>
<p>字符串转化为时间类:</p>
<pre><code>String str2 = &quot;1997-7-7&quot;;
DateFormt df2 = new SimpleDateFormt(&quot;yyyy-MM-dd&quot;);
Date d2 = df2.parse(str2);
</code></pre><blockquote>
<p>字符串中的格式必须和SimDateFormat中的格式相同，否则会报错</p>
</blockquote>
<hr>
<h4 id="Calendar-类（抽象类）–GregorianCalendar-子类"><a href="#Calendar-类（抽象类）–GregorianCalendar-子类" class="headerlink" title="Calendar 类（抽象类）–GregorianCalendar(子类)"></a>Calendar 类（抽象类）–GregorianCalendar(子类)</h4><p>一月是0 二月是1,12月是11。周日是1，周一是2，周六是7.<br>Calendar c = Calendar.getInstance();创建Calendar对象</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div></pre></td><td class="code"><pre><div class="line">Calendar c = <span class="function">ne	w <span class="title">GregorianCalendar</span><span class="params">()</span></span>;</div><div class="line">c.set(<span class="number">2001</span>,<span class="number">1</span>,<span class="number">10</span>,<span class="number">12</span>,<span class="number">23</span>,<span class="number">34</span>);</div><div class="line">Date d = c.getTime();</div><div class="line"><span class="comment">//c.set(Calendar.YEAR,2001);单独定义一个属性，使用当前时刻的时分秒</span></div><div class="line"><span class="comment">//c.setTime(new Date());</span></div><div class="line"><span class="comment">//c.add(Calendar.YEAR,30);增加30年（-30表示减法）</span></div><div class="line"><span class="comment">//getActualMaximun(Calendar.Date);返回一个月大最大天数</span></div><div class="line">print;</div></pre></td></tr></table></figure>
<p><em>一个简单的日历程序：</em></p>
<p><em>源代码如下：</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div></pre></td><td class="code"><pre><div class="line"></div><div class="line"><span class="keyword">import</span> java.util.*;</div><div class="line"><span class="keyword">import</span> java.text.DateFormat;</div><div class="line"><span class="keyword">import</span> java.text.ParseException;</div><div class="line"><span class="keyword">import</span> java.text.SimpleDateFormat;</div><div class="line"></div><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">TestDate</span> </span>&#123;</div><div class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span> <span class="params">(String [] args)</span></span>&#123;</div><div class="line">		<span class="keyword">try</span> &#123;</div><div class="line">			System.out.println(<span class="string">"请输入时间：（YYYY-MM-dd）"</span>);</div><div class="line">			Scanner input = <span class="keyword">new</span> Scanner(System.in);</div><div class="line">			String time = input.nextLine();</div><div class="line">			DateFormat format = <span class="keyword">new</span> SimpleDateFormat(<span class="string">"yyyy-MM-dd"</span>);</div><div class="line">			Date date = format.parse(time);</div><div class="line">			Calendar c = <span class="keyword">new</span> GregorianCalendar();</div><div class="line">			c.setTime(date);</div><div class="line">			c.set(Calendar.DATE, <span class="number">1</span>);</div><div class="line">			System.out.println(<span class="string">"日\t一\t二\t三\t四\t五\t六"</span>);</div><div class="line">			<span class="keyword">for</span>(<span class="keyword">int</span> j = <span class="number">1</span> ; j &lt; c.get(Calendar.DAY_OF_WEEK); j++)&#123;</div><div class="line">				System.out.print(<span class="string">"\t"</span>);</div><div class="line">			&#125;</div><div class="line">			<span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">1</span> ; i &lt; c.getMaximum(Calendar.DATE); i++)&#123;</div><div class="line">				System.out.print(i+<span class="string">"\t"</span>);</div><div class="line">				<span class="keyword">if</span>(c.get(Calendar.DAY_OF_WEEK)==Calendar.SATURDAY)&#123;</div><div class="line">					System.out.println();</div><div class="line">				&#125;</div><div class="line">				c.add(Calendar.DATE, <span class="number">1</span>);</div><div class="line">			&#125;</div><div class="line">		&#125; <span class="keyword">catch</span> (Exception e) &#123;</div><div class="line">			<span class="comment">// TODO Auto-generated catch block</span></div><div class="line">			e.printStackTrace();</div><div class="line">		&#125;</div><div class="line"></div><div class="line">	&#125;</div><div class="line">&#125;</div></pre></td></tr></table></figure>

    

    
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